ColorFlowTools

Complementary Color Generator

Find the complementary color of any base color, the hue that sits directly opposite it on the color wheel. Complementary pairs create strong contrast and are useful for accents, calls to action, and drawing attention to a single element. Enter a base color and the generator shows the complement on a color-wheel visualization, displays both colors with their HEX, RGB, and HSL values, and previews the pairing in a small UI example so you can judge how it feels in context. You can copy any value, save the pair to a palette, or export CSS variables. Because a raw complement can be intense, the tool also shows how the pairing looks applied to real interface elements.

UI preview

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Sample body text showing how these colors read together.

How to use the Complementary Color Generator

  1. Choose a base color. Pick or type your starting color.
  2. See the complement. The opposite hue appears on the color wheel with its values.
  3. Preview and save. Check the UI preview, copy values, or save the pair to a palette.

Examples

  • Blue and orange: A blue base yields an orange complement, a classic high-contrast pairing.
  • Accent button: Use the complement only for a primary button so it stands out against the base.

How it works

A complementary color is found by rotating the base hue by 180 degrees while keeping saturation and lightness. Opposite hues produce maximum hue contrast, which is why the pairing feels vivid. Using the complement sparingly, as an accent, usually reads better than filling large areas with both colors.

Common use cases

  • Choosing a high-contrast accent for buttons or highlights
  • Balancing a dominant color with its opposite
  • Teaching or exploring basic color-wheel relationships

Privacy

All color calculations run in your browser. Nothing you enter is sent to a server. Saved palettes and recent colors are kept only in your browser’s local storage and can be cleared at any time.

Frequently asked questions

How is the complement calculated?

By rotating the base color’s hue 180 degrees on the color wheel and keeping its saturation and lightness.

Why does the pairing look intense?

Opposite hues create the strongest hue contrast. Using the complement as an accent rather than a large fill usually looks more balanced.

Can I save the pair?

Yes. Save both colors to a palette or copy their HEX, RGB, and HSL values.

What is split complementary?

It uses the two hues adjacent to the complement for a softer, still-contrasting scheme. The palette generator can produce it.

Analogous Color Generator Generate analogous colors next to your base hue for a harmonious scheme. Triadic Color Generator Generate a triadic scheme of three evenly spaced hues for balanced contrast. Color Palette Generator Generate color schemes with lock, reorder, and export to CSS, JSON, SVG, and PNG. Color Picker Pick a color and read its HEX, RGB, HSL, HSV, and CMYK values with alpha support. Monochromatic Palette Generator Generate a monochromatic palette by varying lightness of a single hue.